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JSON Schema $Ref Parser
============================
#### Parse, Resolve, and Dereference JSON Schema $ref pointers

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The Problem:
--------------------------
You've got a JSON Schema with `$ref` pointers to other files and/or URLs.  Maybe you know all the referenced files ahead of time.  Maybe you don't.  Maybe some are local files, and others are remote URLs.  Maybe they are a mix of JSON and YAML format.  Maybe some of the files contain cross-references to each other.

```javascript
{
  "definitions": {
    "person": {
      // references an external file
      "$ref": "schemas/people/Bruce-Wayne.json"
    },
    "place": {
      // references a sub-schema in an external file
      "$ref": "schemas/places.yaml#/definitions/Gotham-City"
    },
    "thing": {
      // references a URL
      "$ref": "http://wayne-enterprises.com/things/batmobile"
    },
    "color": {
      // references a value in an external file via an internal reference
      "$ref": "#/definitions/thing/properties/colors/black-as-the-night"
    }
  }
}
```

The Solution:
--------------------------
JSON Schema $Ref Parser is a full [JSON Reference](https://tools.ietf.org/html/draft-pbryan-zyp-json-ref-03) and [JSON Pointer](https://tools.ietf.org/html/rfc6901) implementation that crawls even the most complex [JSON Schemas](http://json-schema.org/latest/json-schema-core.html) and gives you simple, straightforward JavaScript objects.

- Use **JSON** or **YAML** schemas &mdash; or even a mix of both!
- Supports `$ref` pointers to external files and URLs, as well as [custom sources](https://apitools.dev/json-schema-ref-parser/docs/plugins/resolvers.html) such as databases
- Can [bundle](https://apitools.dev/json-schema-ref-parser/docs/ref-parser.html#bundlepath-options-callback) multiple files into a single schema that only has _internal_ `$ref` pointers
- Can [dereference](https://apitools.dev/json-schema-ref-parser/docs/ref-parser.html#dereferencepath-options-callback) your schema, producing a plain-old JavaScript object that's easy to work with
- Supports [circular references](https://apitools.dev/json-schema-ref-parser/docs/#circular-refs), nested references, back-references, and cross-references between files
- Maintains object reference equality &mdash; `$ref` pointers to the same value always resolve to the same object instance
- Tested in Node v10, v12, & v14, and all major web browsers on Windows, Mac, and Linux

Example
--------------------------

```javascript
$RefParser.dereference(mySchema, (err, schema) => {
  if (err) {
    console.error(err);
  }
  else {
    // `schema` is just a normal JavaScript object that contains your entire JSON Schema,
    // including referenced files, combined into a single object
    console.log(schema.definitions.person.properties.firstName);
  }
})
```

Or use `async`/`await` syntax instead. The following example is the same as above:

```javascript
try {
  let schema = await $RefParser.dereference(mySchema);
  console.log(schema.definitions.person.properties.firstName);
}
catch(err) {
  console.error(err);
}
```

For more detailed examples, please see the [API Documentation](https://apitools.dev/json-schema-ref-parser/docs/)

Installation
--------------------------
Install using [npm](https://docs.npmjs.com/about-npm/):

```bash
npm install @apidevtools/json-schema-ref-parser
```

Usage
--------------------------
When using JSON Schema $Ref Parser in Node.js apps, you'll probably want to use **CommonJS** syntax:

```javascript
const $RefParser = require("@apidevtools/json-schema-ref-parser");
```

When using a transpiler such as [Babel](https://babeljs.io/) or [TypeScript](https://www.typescriptlang.org/), or a bundler such as [Webpack](https://webpack.js.org/) or [Rollup](https://rollupjs.org/), you can use **ECMAScript modules** syntax instead:

```javascript
import $RefParser from "@apidevtools/json-schema-ref-parser";
```

Browser support
--------------------------
JSON Schema $Ref Parser supports recent versions of every major web browser.  Older browsers may require [Babel](https://babeljs.io/) and/or [polyfills](https://babeljs.io/docs/en/next/babel-polyfill).

To use JSON Schema $Ref Parser in a browser, you'll need to use a bundling tool such as [Webpack](https://webpack.js.org/), [Rollup](https://rollupjs.org/), [Parcel](https://parceljs.org/), or [Browserify](http://browserify.org/). Some bundlers may require a bit of configuration, such as setting `browser: true` in [rollup-plugin-resolve](https://github.com/rollup/rollup-plugin-node-resolve).

API Documentation
--------------------------
Full API documentation is available [right here](https://apitools.dev/json-schema-ref-parser/docs/)

Contributing
--------------------------
I welcome any contributions, enhancements, and bug-fixes.  [Open an issue](https://github.com/APIDevTools/json-schema-ref-parser/issues) on GitHub and [submit a pull request](https://github.com/APIDevTools/json-schema-ref-parser/pulls).

#### Building/Testing
To build/test the project locally on your computer:

1. __Clone this repo__<br>
`git clone https://github.com/APIDevTools/json-schema-ref-parser.git`

2. __Install dependencies__<br>
`npm install`

3. __Run the tests__<br>
`npm test`

License
--------------------------
JSON Schema $Ref Parser is 100% free and open-source, under the [MIT license](LICENSE). Use it however you want.

This package is [Treeware](http://treeware.earth). If you use it in production, then we ask that you [**buy the world a tree**](https://plant.treeware.earth/APIDevTools/json-schema-ref-parser) to thank us for our work. By contributing to the Treeware forest you’ll be creating employment for local families and restoring wildlife habitats.

Big Thanks To
--------------------------
Thanks to these awesome companies for their support of Open Source developers ❤

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